package com.xiao.common.util;

import org.springframework.stereotype.Component;

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.UUID;

/**
 * @Author xiaoxiaoping
 * @Date 2020/1/8
 */
public class WorkIdUtil {
    public static String[] chars36 = new String[] { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
    public static String[] chars62 = new String[] { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
    private static WorkIdUtil keyWorker = null;

    public static synchronized String nextId() {
        return keyWorker.getNextId();
    }

    private WorkIdUtil() {

    }

    public synchronized String getNextId() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UUID.randomUUID().toString().replace("-", "");
        for (int i = 0; i < 16; i++)
        {
            String str = uuid.substring(i * 2, i * 2+ 2);
            int x = Integer.parseInt(str, 16);
            // 如果是 chars62,则是x%62
            shortBuffer.append(chars36[x % 36]);
        }
        return shortBuffer.toString();
    }

    private long tilNextMillis(long lastTimestamp) {
        long timestamp;
        for(timestamp = this.timeGen(); timestamp <= lastTimestamp; timestamp = this.timeGen()) {
        }

        return timestamp;
    }

    private long timeGen() {
        return System.currentTimeMillis();
    }

    private long getMachineNum() {
        StringBuilder sb = new StringBuilder();
        Enumeration e = null;

        try {
            e = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException var6) {
            var6.printStackTrace();
        }

        while(e.hasMoreElements()) {
            NetworkInterface ni = (NetworkInterface)e.nextElement();
            sb.append(ni.toString());
        }

        long machinePiece = (long)sb.toString().hashCode();
        return machinePiece;
    }
    static {
        keyWorker = new WorkIdUtil();
    }
}
